Operator's guide to using the Teletype Model 15 in Teletypewriter Exchange Service (TWX). Published in 1943. Revised December 1954. Includes "Abbreviations Used in Typing Either to an Operator or Subscriber."
This booklet was copyright 1943 by AT&T, but the copyright on this edition was not renewed. This edition therefore entered the public domain upon the expiration of its initial copyright. This digital reprint remains in the public domain.